Disabling images is in the exact same location it was before, BUT it's no longer a checkbox (since a third option was added), so I don't know what the problem would be.

Load images...

Disabling Javascript has been moved to Web Developer tools, because that is where it logically belongs.
If you were using the disabing of javascript for malicious script blocking, you should use an add-on like NoScript instead, otherwise you will be breaking a lot of websites.

Disable JavaScript

"There will be times when the position you advocate, no matter how well framed and supported, will not be accepted by the public simply because you are who you are." -- Merrill Rose

So what about the other JavaScript options that are not available in NoScript, and also got reset to their defaults in Firefox 23? Firefox took away these options because they thought that their users were too stupid to know how to use them. I sincerely hope this is not an opinion you share, as this attitude was why I left Firefox. (It is also the reason they are switching to Australis.)

I used to have load pictures automatically checked and javascript checked but in the exceptions I unchecked all three items. That option is no longer available. Moonchild, can you please bring it back. I felt the browser was safer with those items unchecked. Thank you.